trying to decide on which size looks best.

 

Be hard to get a 295/60 to fit. Gotta optimize backspace and wheel well hammering. 295/55 i had was tight enough



I run 275/60 now and like it more but my wheels need bit more backspacing

 

295/55

 

I have 295/60 or 65 r15s on my drag rims. They fit my 1987 firebird but it was pretty tight, dropped my 60' from 2.2s on NT555s to 1.8s with alittle spin but I blame the low end tq of a 521cuin motor lol. Looks alot like Orr's

 

275/60R15 on 15x8's with 4.5" backspacing.

 

WHOOPS missed that you said drag radial, my bad. Those pics are just street tires.

 

What back spacing are you at? And can you take a pic from rear of car? I have same tires as you. I have a 4th gen rearend but need to buy wheels. Don't know what BS I need..I think either 5.5 or 6.5

 

Stock rearend or 4th gen?

 

Stock 9-bolt rear end (though not original to the car, but no modifications were made to it.)

 

4th gen rear width. 15x10 with 7.25" bs. I would rather have 7.5" as tire can touch fender lip. Rolled the lip so its better but still touches on 295 tires. These 275 pros however clear ok so far

 

295's. Check the shape of the sidewall to tread transition vs the 275's below


275


More rounded off than the 295's

 

Ok..I was thinking of doing a 5.5 BS on either a 15x8 or 15x10...or maybe a 6.5 BS...either way I'm going to have to roll the fenders huh?

 

With a 4th gen rear you need 6.5 for a 8" wheel. 7.5 for 10". No way to get around that
Not many wheels available in 7.5" in 10 wide

 

What if I go with a 17 inch 4th gen wheel. What options do I have then?

 

For drag pack cant beat a gto spare front runner and 17" m&h or similar runner tire. Or stick with 15x4 stuff if you have stock brakes.

For the rear i'd match it with a zr1 style rim in a 315/35/17 mickey et street radial 2 if you want a street strip tire. They will hook you up! My 305/35/19's have gone mid 1.40 60 foots ramping power in slow but they showed no signs of reaching limit. I bet i could go high 1.3's on them and thats a 19" rim! 315/17 should do as well or better.
That be a 17x11 rear rim with 56 ish mm offset. Should bolt in and not require spacers. If too close you can space it out with small slip ons